KR20090047849A - Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof - Google Patents

Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof Download PDF

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Publication number
KR20090047849A
KR20090047849A KR1020070113911A KR20070113911A KR20090047849A KR 20090047849 A KR20090047849 A KR 20090047849A KR 1020070113911 A KR1020070113911 A KR 1020070113911A KR 20070113911 A KR20070113911 A KR 20070113911A KR 20090047849 A KR20090047849 A KR 20090047849A
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South Korea
Prior art keywords
porous ceramic
ceramic filter
composition
natural graphite
porous
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KR1020070113911A
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Korean (ko)
Inventor
서기식
한대곤
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주식회사 칸세라
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Priority to KR1020070113911A priority Critical patent/KR20090047849A/en
Publication of KR20090047849A publication Critical patent/KR20090047849A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/638—Removal thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0051—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/425—Graphite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

The present invention relates to a composition for a porous ceramic filter comprising natural graphite and ceramic particles, a porous ceramic filter comprising the same, and a method of manufacturing the same. The composition for a porous ceramic filter of the present invention is characterized in that the inorganic component of natural graphite, including natural graphite, combines the ceramic particles, and the carbon component is removed to form pores. Accordingly, the porous ceramic filter using the composition of the present invention has excellent mechanical strength and uniform porosity.

Natural graphite, impression graphite, ceramic particles, porous ceramic filter.

Description

Composition for porous ceramic filter, porous ceramic filter comprising the same and method for manufacturing thereof {Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method}

The present invention is natural graphite; And a composition for a porous ceramic filter comprising ceramic particles, a porous ceramic filter including the same, and a method of manufacturing the same.

Dust collector filters are used in a variety of applications, such as pollution prevention and product recovery from hot gases, such as industrial waste disposal in the chemical, power and steel sectors. Specific examples in which such a dust collecting filter is used include a catalyst carrier for automobile exhaust purification, a heat exchanger of a gas turbine, and a filtering system for a diesel engine.

The dust collecting filter is most commonly used as a diesel particulate filter (DPF), which collects particulate matter (PM) discharged from a diesel engine, and is generally a porous honeycomb. It is a structure.

This porous ceramic honeycomb structure of the DPF has a plurality of cells formed in parallel with the exhaust flow. In addition, adjacent cells are separated by a porous partition wall, and the inlet and outlet sections are sealed alternately, functioning as a wallflow method to capture particulate matter while the introduced exhaust gas passes through the porous partition wall. do.

However, excessive accumulation of particulate matter on the porous partition wall of the DPF may cause a pressure loss of the filter and a decrease in engine output. Accordingly, the DPF undergoes a regeneration process in which the collected particulate matter is burned and removed by an external ignition means such as an electric heater or a burner every predetermined time. Therefore, the DPF material is required to have a low pressure loss to prevent the degradation of the engine performance, and to have a strength and uniform porosity to withstand the thermal shock caused by rapid temperature change during engine regeneration or shutdown. have.

In order to improve the performance of ceramic filters, Japanese Laid-Open Patent Publication No. 1990-83278 discloses a method of using combustible carbon as a pore-forming agent, but the strength of the ceramic filter is reduced and cracks are generated by the addition of the pore-forming agent. There is this.

Japanese Laid-Open Patent Publication No. 2003-183087 discloses a method of using a hollow polymer as a pore-forming agent, but hollow particles due to foaming have a problem of insufficient particle strength and destruction of particles when mixed with ceramic particles.

An object of the present invention is to solve the above problems of the prior art, specifically, including natural graphite, the inorganic component of natural graphite combines ceramic particles, the carbon component is removed to form pores, It is to provide a composition for a porous ceramic filter having a mechanical strength and uniform porosity, a porous ceramic filter comprising the same, and a method of manufacturing the same.

The present invention provides a composition for a porous ceramic filter containing natural graphite and ceramic particles as a means for solving the above problems.

The natural graphite included in the composition of the present invention is preferably at least one selected from the group consisting of impression graphite, high crystalline graphite and microcrystalline graphite. In addition, the content of the natural graphite is preferably 5 to 50 parts by weight based on 100 parts by weight of ceramic particles.

The ceramic particles included in the composition of the present invention is preferably at least one selected from the group consisting of silicon carbide, alumina, silica, mullite, and cordierite.

The present invention provides a porous ceramic filter comprising the composition according to the present invention as another means for solving the above problems.

The present invention as another means for solving the above problems, the first step of mixing the natural graphite and ceramic particles; And a second step of forming and firing the mixture.

The inorganic component contained in the natural graphite binds the ceramic particles, and the carbon component is removed to form pores, which have better mechanical strength and uniform pores than the ceramic filter produced using the binder and the pore-forming agent, respectively.

The present invention relates to a composition for porous ceramic filters comprising natural graphite and ceramic particles.

The composition of the present invention is characterized in that the inorganic component of the natural graphite, including natural graphite, serves as a binder to connect the ceramic particles, and the carbon component is removed to form pores so that the binder and the pore-forming agent are not required.

The conventional porous ceramic filter was prepared by including both a binder for forming ceramic particles and a pore forming pore, but the porous ceramic filter using the composition of the present invention may not include a binder and a pore forming agent. As a result, the ceramic particles are bonded together with the pore formation during the sintering process, and thus have superior strength than the conventional ceramic filter. In addition, there is an advantage that can adjust the size of the pore according to the particle size of the natural graphite. Accordingly, the porous ceramic filter to which the composition of the present invention is applied has a uniform porosity.

Hereinafter, the composition for the porous ceramic filter of the present invention will be described in detail.

The composition for a porous ceramic filter of the present invention is characterized by containing natural graphite. In the manufacture of the porous ceramic filter, the inorganic component of natural graphite serves as a binder for connecting the ceramic particles, and the carbon component is removed to form pores of the ceramic filter.

Generally, kinds of natural graphite include impression graphite, high crystalline graphite or microcrystalline graphite. The natural graphite usable in the present invention is not particularly limited, and one or more selected from the group consisting of impression graphite, high crystalline graphite and microcrystalline graphite can be used, and preferably impression graphite can be used.

The content of the natural graphite is preferably 5 to 50 parts by weight based on 100 parts by weight of ceramic particles. When the content is less than 5 parts by weight, there is a fear that the bonding strength of the ceramic particles may fall, and when the content exceeds 50 parts by weight, the strength of the ceramic filter may fall.

The composition for a porous ceramic filter of the present invention contains ceramic particles together with natural graphite. The ceramic particles are not particularly limited as long as they are used in this field to form a skeleton of the porous ceramic filter. For example, one or more selected from the group consisting of silicon carbide, alumina, silica, mullite, and cordierite may be used. have.

The composition for a porous ceramic filter according to the present invention may further include a metal oxide in the above-described component.

Metal oxides, together with the inorganic components of natural graphite, serve to strengthen the bonding of ceramic particles.

The content of the metal oxide preferably includes 0.5 to 10 parts by weight based on 100 parts by weight of ceramic particles.

The invention also relates to a porous ceramic filter comprising the composition for a porous ceramic filter according to the invention.

Porous ceramic filter of the present invention is a ceramic particle is bonded by the inorganic component of the natural graphite, the pores are formed by removing the carbon component of the natural graphite, it is characterized by having excellent mechanical strength and uniform porosity.

Hereinafter, an embodiment of the porous ceramic filter of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view and a cross-sectional view of a porous ceramic filter according to an aspect of the present invention. The porous ceramic filter 1 is formed with a plurality of cells 2 penetrated in the longitudinal direction, and the adjacent cells 2 are separated by the porous partition wall 3. In addition, the inlet side 1a or the outlet side 1b of the said cell 2 is sealed by the sealing material 4 by turns. Accordingly, when the porous ceramic filter is used in a diesel engine dust filter or the like, the gas G flowing into the cell 2 passes through the porous partition wall 3 and is discharged through an adjacent cell, and the fine particles in the gas It is collected on the porous partition wall 3. Generally, a porous ceramic filter is used as an assembly by joining a plurality of porous ceramic filters by a bonding material. 3 illustrates one embodiment of a porous ceramic filter assembly.

The invention also comprises a first step of mixing the natural graphite and ceramic particles; And it relates to a method of manufacturing a porous ceramic filter comprising a second step of molding and firing the mixture.

The first step of the invention is the step of mixing the natural graphite and ceramic particles.

The type and content of the natural graphite and ceramic particles used in the present invention are as described above. In the first step of the present invention, there is no mixing process of the binder and the pore-forming agent, and thus the manufacturing process is more economical, and the composition may be mixed more uniformly.

In addition, in the first step, the metal oxide may be further mixed, and specific types and contents thereof are as described above.

The second step of the invention is the step of molding and firing the mixture. The method of molding using the mixture of the first step is not particularly limited, and conventional means known in the art may be employed without limitation. For example, a desired shape can be molded to the mixture through an extrusion process or the like. In addition, before firing, the molded article molded in the above-described manner may be dried by conventional means such as microwaves and hot air, and cut into predetermined dimensions to perform the firing process. In the firing process, the inorganic component of natural graphite binds ceramic particles, and the carbon component is removed to form pores.

The porous ceramic filter manufactured by the above method may be bonded by a bonding material and used as an aggregate.

1 is a perspective view of a porous ceramic filter according to one aspect of the present invention.

2 is a cross-sectional view of a porous ceramic filter according to one aspect of the present invention.

3 is a collection of porous ceramic filters according to one aspect of the invention.

<Description of Drawing>

1: porous ceramic filter 2: cell

3: porous partition wall 4: sealing material

5: bonding material

Claims (9)

Natural graphite; And Porous ceramic filter composition comprising ceramic particles. The method of claim 1, Natural graphite is a composition for porous ceramic filter, characterized in that at least one selected from the group consisting of impression graphite, high crystalline graphite, and microcrystalline graphite. The method of claim 1, The content of natural graphite is a composition for a porous ceramic filter, characterized in that 5 to 50 parts by weight based on 100 parts by weight of ceramic particles. The method of claim 1, Ceramic particles are at least one selected from the group consisting of silicon carbide, alumina, silica, mullite, and cordierite composition for a porous ceramic filter. The method of claim 1, Porous ceramic filter composition, characterized in that it further comprises a metal oxide. The method of claim 5, wherein The content of the metal oxide is a composition for a porous ceramic filter, characterized in that 0.5 to 10 parts by weight with respect to 100 parts by weight of ceramic particles. A porous ceramic filter comprising the composition according to claim 1. A first step of mixing the natural graphite and ceramic particles; And Method for producing a porous ceramic filter comprising a second step of molding and firing the mixture. The method of claim 8, Method for producing a porous ceramic filter, characterized in that it further comprises a metal oxide in the mixture of the first step.
KR1020070113911A 2007-11-08 2007-11-08 Composition for porous ceramic filter, porous ceramic filter comprising the same and preparation method thereof KR20090047849A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101430677B1 (en) * 2013-02-18 2014-08-18 주식회사 코센테크 A composite material for heat sink
KR20150075868A (en) * 2013-12-26 2015-07-06 한국기계연구원 A Reaction Bonded Silicon Carbide and A Manufacturing method of the same
KR20220086729A (en) * 2020-12-16 2022-06-24 주식회사 씨엠티 Ceramic composition for porous filter, and porous honeycomb ceramic filter and filter segment manufactured using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101430677B1 (en) * 2013-02-18 2014-08-18 주식회사 코센테크 A composite material for heat sink
KR20150075868A (en) * 2013-12-26 2015-07-06 한국기계연구원 A Reaction Bonded Silicon Carbide and A Manufacturing method of the same
KR20220086729A (en) * 2020-12-16 2022-06-24 주식회사 씨엠티 Ceramic composition for porous filter, and porous honeycomb ceramic filter and filter segment manufactured using the same

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